Food tests

Biuret Test

Used to test for proteins.

Biuret Test Color Change

Turns colorless solutions purple in presence of proteins, and remains blue if no protein is present.

Biuret Test Process

Add Biuret reagent to the sample and observe color change.

Benedict's Test

Used to test for reducing sugars.

Benedict's Test Color Change

Changes from blue to green, yellow, or brick red depending on the sugar concentration. Remains blue if no reducing sugars are present.

Benedict's Test Process

Mix the sample with Benedict's reagent and heat in a boiling water bath.

Ethanol Test

Used to test for lipids.

Ethanol Test Color Change

When lipid is present, a white emulsion forms; no change occurs in the absence of lipids.

Ethanol Test Process

Mix the sample with ethanol, then add water and observe for emulsion.

Iodine Test

Used to test for starch.

Iodine Test Color Change

Turns blue-black when starch is present and remains brown if no starch is present.

Iodine Test Process

Add iodine solution to the sample and observe color change.

DCPIP Test

Used to test for Vitamin C.

DCPIP Test Color Change

Blue DCPIP turns colorless when Vitamin C is present; remains blue if no Vitamin C is present.

DCPIP Test Process

Add the sample to DCPIP solution and observe for color change.